Only stays running when I throttle it dies at idle Colman 400 utv

[Richard shepard]

I have a 2021 colman 400utv engine will start and idle, as soon as you hit throttle to move engine dies and will only start when you throttle it, let off throttle it dies, I replaced the injector and plug still the same, anyone have any other ideas

[Rainman]

On 3/9/2024 at 3:15 PM, Richard shepard said:

I have a 2021 colman 400utv engine will start and idle, as soon as you hit throttle to move engine dies and will only start when you throttle it, let off throttle it dies, I replaced the injector and plug still the same, anyone have any other ideas

Did you try and replace the fuel filter? Also, what type of of are you using, as ethanol I believe can clog things up and non-ethanol is recommended.

I also have a 2021 ut400 and had running issues a little different than yours, but in my case I had water in the gas tank. Once cleaned out, problem solved. The problem I was having was that it was hard to start and when started, unless it was totally warmed up, if I stepped on the gas it would stall.

Definitely sounds like a fuel issue ...

[Greg Kilgore]

Reset the computer. Easy to do. Procedure is

1. With machine off. Turn key to "ON" don't try to start. Listen for the fuel pump to kick on.

2. As soon as you hear fuel pump kick on. Turn key "OFF".

3. Do the cycle of "ON" "OFF" 5 time within 30 seconds. Making sure the fuel pump kicks ons each time. Do NOT start the machine.

4. After the 5th "ON/OFF" cycle. Leave "OFF" for 30 seconds. 

5. Start the machine as usual. 

Also always when starting the machine. The correct procedure is as follows.

A. Turn key "ON"

B. Listen for the fuel pump to kick on, build up pressure, and kick off.

C. Turn key to "START"

Hope this helps.

[aefron88]

2nd Greg's recommendation. Resetting the computer will zero out all the sensors, IAVV and throttle position, fuel trim, etc.

From there if that doesn't fix it let us know and we can help further troubleshoot.